The World's Smallest RC Helicopter

"The 60 mm rotor diameter Picoflyer is the smallest RC helicopter ever presented, it is a one-off prototype and it is not intended for sale." (Proxyflyer) Um, okay, but when is it going to be for sale?

Key benefits of the helicopter:
* Absolutely stable without the use of any gyros or autopilots
* There are no servos, actuators, rods, links, gears or other moving part
* The whole helicopter is operated and controlled by 3 electric motors
* Forward flight is achieved by tilting the helicopter with the tail propeller